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NON-WHOLLY OWNED SUBSIDIARIES - Summarized Cash Flow Activities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of subsidiaries [line items]      
Operating $ 839 $ 730 $ 1,083
Investing 326 (399) (441)
Financing (868) (317) (514)
Non-Wholly Owned Subsidiaries      
Disclosure of subsidiaries [line items]      
Operating 1,041 875 1,110
Investing 312 (406) (437)
Financing (1,055) (455) (555)
U.K. regulated distribution operation      
Disclosure of subsidiaries [line items]      
Operating 273 241 271
Investing 344 (372) (416)
Financing (582) 133 147
Brazilian regulated gas transmission operation      
Disclosure of subsidiaries [line items]      
Operating 768 634 839
Investing (32) (34) (21)
Financing $ (473) $ (588) $ (702)